Fluke 192/196/199

Users Manual

Making Relative Measurements

A relative measurement displays the present measurement result relative to a defined reference value.

The following example shows how to perform a relative voltage measurement. First obtain a reference value:

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Display the METER key labels.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Measure a voltage to be used as

 

 

 

 

 

 

reference value.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Set RELATIVE to ON. (ON is

 

 

 

 

 

 

 

 

 

 

 

highlighted.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This stores the reference value as reference for subsequent measurements. The stored reference value is displayed in small digits at the bottom right side of the screen after the word REFERENCE.

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Measure the voltage to be

 

 

compared to the reference.

 

 

 

 

 

 

Observe that the main reading is displayed as variations from the reference value. The actual reading with its bargraph is displayed beneath these readings. (See Figure 15.)

Figure 15. Making a Relative Measurement

You can use this feature when, for example, you need to monitor input activity (voltage, resistance, temperature) in relation to a known good value.

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